Definitely talk to your banker. If you want to get euros before the trip you'll need to do this several days in advance.
Also, think about using a debit card (with no overdraft protection) with only a small amount in the account. Put your name on that account so that if (when
) she needs more, you can make the transfer from here without her having to worry about going to a foreign bank. Another benefit of only a small amount on the debit card is that if it gets lost or stolen, it's only a small amount that gets gone. (This is what I did with my DD#2.)
If you haven't checked into cell phones yet, consider renting an overseas phone from your cell carrier. My carrier provided excellent rates with all the recharging adapters. It was a $20 deposit that was put towards the final bill and all I had to pay for the rental was return shipping.
Make 3 copies of her passport/credit cards/emergency contacts/medical info/itinerary (hotel names & numbers.) 1 copy for you, 1 copy in her luggage, 1 copy in her purse/backpack (kept in a different pocket from her wallet.) If it's a guided trip, probably an extra copy for her chaperone.
Wishing a wonderful trip for your DD . . . it will be an awesome experience for her.